what is the command syntax for programming a cisco router to speak only with a proxy server?

i just want to know the command syntax for programming a cisco router to speak only with my proxy server such that users request to the internet shall only pass through the proxy server.

you should block the traffic to Internet (HTTP basically) form every user except the proxy ip address, in this way all the users have to configure the proxy to get out:
the access-list looks like this one:
ip permit tcp host any eq www
then apply on the interface where users and proxy are located.
Let me know if you need to know hoe access list are used.
Ciao Maurizio

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